53 lines
2 KiB
TypeScript
53 lines
2 KiB
TypeScript
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import { parse, isAfter, differenceInCalendarDays } from 'date-fns';
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export class SunriseSunsetStreakCalculator {
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private readonly todayDate: Date;
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constructor(private readonly today: string) {
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this.todayDate = parse(today, 'yyyy-MM-dd', new Date());
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}
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getStreakLength(correctDays: string[]): number {
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if (correctDays.length === 0) {
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console.log(`No correct days, returning 0.`);
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return 0;
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} else if (!correctDays.some((day) => day === this.today)) {
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console.log(`Today is not in the list of correct days`);
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return 0;
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}
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const daysAsDates = correctDays.map((day) => parse(day, 'yyyy-MM-dd', new Date()));
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const sortedDays = daysAsDates.sort((a, b) => b.getTime() - a.getTime());
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const sortedDaysWithoutToday = correctDays
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.filter((day) => day !== this.today)
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.map((day) => parse(day, 'yyyy-MM-dd', new Date()))
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.sort((a, b) => b.getTime() - a.getTime());
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const daysBetweenTodayAndMostRecentDay = differenceInCalendarDays(this.todayDate, sortedDaysWithoutToday[0]);
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if (daysBetweenTodayAndMostRecentDay > 1) {
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console.log(`Today is more than one day after the most recent correct day`);
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return 1;
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}
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let streakLength = 1;
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for (const [index, day] of sortedDays.entries()) {
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const nextDay = sortedDays[index + 1];
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if (nextDay === undefined) {
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console.log(`No next day, returning streak length of ${streakLength}`);
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return streakLength;
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}
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const daysBetween = differenceInCalendarDays(day, nextDay);
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console.log(`Days Between ${day} - ${nextDay}`, daysBetween);
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if (daysBetween === 1) {
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streakLength++;
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} else {
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console.log(`Days between is not 1, returning streak length of ${streakLength}`);
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return streakLength;
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}
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}
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}
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}
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